Michael Schneider Variety Editor at Large As Carol Burnett turns 90, she bristles at the idea of looking back at her legacy. She’s not one to watch old episodes of her iconic “The Carol Burnett Show,” for example. “I’m not like Norma Desmond,” she quips, referring to the fading star in “Sunset Boulevard.” “The only time I do it is if I have to for a reason.” In this case, NBC gave her a good one. The network is set to air “Carol Burnett: 90 Years of Laughter + Love” on April 26, and the special features both new performances and clips from Burnett’s storied career. And it gave Burnett a chance to reminisce with old friends — and new. “It’s exactly what I wanted,” Burnett said. “I didn’t want a birthday party with cake and balloons and confetti and all of that. What I wanted was to have an entertaining show. And that’s what we got. It’s a variety show, with live entertainment by Bernadette Peters, Kristin Chenoweth, Billy Porter, Katy Perry, Darren Criss and Sutton Foster. And then funny moments with Kristen Wiig, Allison Janney and Laura Dern. We had a 19-piece orchestra live.”